This collection of rings is ready for 3D printing.Ring sizes 15.5 16 16.5 17 17.5 18 18.5 19 mm. Approximate weight of rings by size(GOLD 14K): 15.5mm-1.86g 16mm-1.9g 16.5mm-1.94g 17mm-1.98g 17.5mm-2.06g 18mm-2.11g 18.5mm-2.16g 19mm-2.21g. I can make to order with your parameters.